Elliptical-to-Rectangular Geometry
Provides a defined physical transition between non-identical waveguide cross-sections while maintaining the required rectangular output interface.
Elliptical To Rectangular Waveguide Adapter
Elliptical to rectangular waveguide adapters are specialized components designed to seamlessly transition microwave signals between elliptical and rectangular waveguide formats. These adapters are critical for integrating systems with different waveguide interfaces, ensuring efficient signal transmission and minimal reflection in various communication and radar applications.
Connect an elliptical waveguide feeder to rectangular waveguide equipment with a configurable adapter family covering a published overall frequency range of 1.7 to 26.5 GHz. The product datasheet lists WR340 through WR62 rectangular waveguide interfaces, 1.05 VSWR, 0.01 dB insertion loss and model-dependent peak-power ratings from 30 to 550 kW.
Standard and customized mechanical configurations are available. Operating band, elliptical interface, rectangular waveguide size, flange type, material, body style and dimensions must be confirmed against the selected part number and approved drawing.
System Position
Place the Adapter Between the Actual Mating Interfaces
A reliable selection starts with the complete signal path rather than the rectangular waveguide size alone.
For the elliptical transmission line itself, review Elliptical Waveguide and Transition . For additional rectangular routing, review Straight Waveguide Sections .
Configuration Benefits
Built Around Interface Compatibility and Controlled RF Transfer
The adapter is specified as an engineered transition, not as a universal mechanical coupling.
Catalog Models
Published Electrical Model Data
| Model | Frequency Range (GHz) |
VSWR | IL (dB) |
Peak Power (kW) |
WG Type | Interface |
|---|---|---|---|---|---|---|
| DH-26EWALT… | 2.2–2.6 | 1.05 | 0.01 | 550 | WR340 | UAR26/CAR26 |
| DH-32EWALT… | 2.6–3.1 | 1.05 | 0.01 | 550 | WR284 | UDR32/PDR32 |
| DH-40EWALT… | 3.4–4.2 | 1.05 | 0.01 | 310 | WR229 | UDR40/PDR40 |
| DH-48EWALT… | 4.4–5.0 | 1.05 | 0.01 | 190 | WR187 | UDR48/PDR48 |
| DH-48REWALT… | 5.0–6.0 | 1.05 | 0.01 | 150 | WR187 | UAR48/CAR48 |
| DH-70REWALT… | 5.85–7.125 | 1.05 | 0.01 | 100 | WR137 | UDR70/PDR70 |
| DH-84REWALT… | 7.1–8.5 | 1.05 | 0.01 | 80 | WR112 | UAR84/CAR84 |
| DH-100REWALT… | 10.0–11.7 | 1.05 | 0.01 | 80 | WR90 | UDR100/PDR100 |
| DH-120REWALT… | 10.95–12.75 | 1.05 | 0.01 | 50 | WR75 | UBR120/PBR120 |
| DH-140REWALT… | 5.0–6.0 | 1.05 | 0.01 | 30 | WR62 | UAR48/CAR48 |
The DH-140REWALT row is retained exactly as printed in the source PDF. Its published 5.0–6.0 GHz range and UAR48/CAR48 interface do not appear consistent with the displayed WR62 waveguide type. Confirm the complete part number and approved technical data before ordering.
| Body Style | Length (mm) |
Transition Length (mm) |
Width (mm) |
Published WG Entry* | Material |
|---|---|---|---|---|---|
| Adjustable | 260 | 180 | 160 | WR340 | Brass |
| Adjust-free | 260 | 180 | 152 | WR284 | Brass |
| Adjustable | 240 | 170 | 125 | WR229 | Brass |
| Adjustable | 180 | 120 | 106 | WR187 | Brass |
| Adjustable | 180 | 120 | 94 | WR187 | Brass |
| Adjustable | 102 | 69 | 68 | WR137 | Brass |
| Adjustable | 94 | 64 | 60 | WR112 | Brass |
| Adjustable | 86 | 44 | 44 | WR90 | Brass |
| Adjustable | 84 | 44 | 44 | WR75 | Brass |
| Adjustable | 82 | 39 | 39 | WR62 | Brass |
Material Selection
Confirm Material at Part-Number Level
The published sources reference several materials. The required construction should therefore be written into the quotation, part number and approved drawing rather than inferred from a family-level statement.
RFQ Preparation
Information Needed to Define the Adapter
Supplying the complete interface information reduces the risk of selecting a mechanically compatible but electrically unsuitable configuration.
01
Operating Frequency
State the required operating band and whether full-band or narrower-band performance is needed.
02
Elliptical Waveguide Interface
Provide the elliptical feeder model, manufacturer reference, cross-section dimensions or mating drawing.
03
Rectangular Waveguide and Flange
Identify the WR size, IEC or EIA designation, cover or grooved face and any clocking requirement.
04
Power and Sealing Requirement
State peak and continuous-wave power, pressure requirements and whether RF or environmental sealing is required.
05
Mechanical Envelope
Provide the available length, width, nearby obstructions, mounting direction and adjustable or adjust-free preference.
06
Material, Environment and Quantity
Specify material preference, operating environment, temperature, finish requirements, project quantity and documentation needs.
Application Areas
Suitable Where Elliptical and Rectangular Interfaces Must Be Integrated
Application suitability depends on the selected model, final interface, power level and environmental configuration.
Related Waveguide Solutions
Complete the Transmission Path with Compatible Components
Review adjacent product families when the project requires the feeder, additional transition geometry, flange selection or downstream waveguide routing.
Frequently Asked Questions
Selection and Configuration Questions
Is the complete 1.7–26.5 GHz range covered by the displayed model table?
No. The PDF states an overall family range of 1.7–26.5 GHz, while the visible table contains individual rows from 2.2 to 12.75 GHz. Bands outside the displayed rows require confirmation against an available or customized configuration.
Which insertion-loss value should be used?
The product page states insertion loss better than 0.1 dB, while the product PDF lists 0.01 dB for each displayed catalog row. Use the value confirmed for the selected model, operating band and final approved configuration.
Can the flange type be customized?
The published ordering information includes cover and grooved flange coding, and the product page states that mechanical configurations can be customized. Provide the exact mating flange designation or drawing for review.
Which material is standard?
The available sources reference copper, aluminum, Cu, brass and an aluminum ordering suffix. Material is therefore configuration-dependent and should be confirmed in the quotation, complete part number and approved drawing.
What is the difference between adjustable and adjust-free bodies?
The source mechanical table lists adjustable bodies for most displayed waveguide sizes and one adjust-free WR284 entry. The required body style should be selected according to installation, tuning and approved mechanical requirements.
What should be supplied for a custom adapter request?
Supply the operating band, elliptical feeder information, rectangular waveguide and flange designation, power level, sealing requirement, material, installation envelope, environment, quantity and any mating drawings.
